How to display loading image each time when we change drop downs selection in ASP .NET

Question

0.00/5 (No votes)

See more:

In my application i have two drop downs one is year drop down and second is month drop down and below is my jquery function
which i had used to display loading image on the selection change of each drop down but this javascript function is working only for 
first time of my drop down selection and it is working only for one drop down it is not showing for second drop down i had tried 
with onchange event also by calling it in my dropdownlist but its not working


<pre lang="Javascript"><script type="text/javascript">
            $(function year() {
                $(".modal1").hide();
                $("#ddlYear").change(function year() {
                    $(".modal1").show();
                    var top = Math.max($(window).height() / 2 - loading[0].offsetHeight / 2, 0);
                    var left = Math.max($(window).width() / 2 - loading[0].offsetWidth / 2, 0);
                    modal1.css({ top: top, left: left });
                });
            });
           
        </script>
    <script type="text/javascript">
        $(function month() {
            $(".modal1").hide();
            $("#ddlMonth").change(function month() {
                $(".modal1").show();
                var top = Math.max($(window).height() / 2 - loading[0].offsetHeight / 2, 0);
                var left = Math.max($(window).width() / 2 - loading[0].offsetWidth / 2, 0);
                modal1.css({ top: top, left: left });
            });
        });
    </script>
<asp:DropDownList ID="ddlYear" runat="server" Height="22px" Width="121px" OnSelectedIndexChanged="ddlYear_SelectedIndexChanged" onchage="validate year();" AutoPostBack="True">
 <asp:DropDownList ID="ddlMonth" runat="server"  Height="22px" Width="121px" AutoPostBack="True" onchage="validate month();"  OnSelectedIndexChanged="ddlMonth_SelectedIndexChanged">

What I have tried:

i had tried by calling my function in ochnage of drodownlist but its not wroking

Posted 24-Oct-17 22:23pm

Member 12324523

Updated 25-Oct-17 21:26pm

Add a Solution

Comments

Karthik_Mahalingam 25-Oct-17 5:30am

are you using update panel ?

Member 12324523 25-Oct-17 5:34am

yes i am using update panel

Member 12324523 25-Oct-17 6:39am

Can anyone help me out how to resolve this

Karthik_Mahalingam 25-Oct-17 8:34am

how you are hiding the modal after open ?

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Karthik_Mahalingam · Answer 1 · 2017-10-25T21:26:00

refer this example

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication1.WebForm1" %>

<%@ Register Assembly="Microsoft.ReportViewer.WebForms, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845DCD8080CC91" Namespace="Microsoft.Reporting.WebForms" TagPrefix="rsweb" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
     
    <style>
        .modal1 {
            width:200px;
            height:150px;
            background-color:gray;
        }
    </style>
    <script> 

        $(function () {

            $(".modal1").hide();
            $( '#<%= ddlYear.ClientID %>'  + ',#<%= ddlMonth.ClientID %>').change(function () {
                $(".modal1").show(); 
            });
             
        });

        function pageLoad() {   // use this when you are using update panel
            $(".modal1").hide();
        }


        function close(){
            $(".modal1").hide();
        }


    </script>
</head>
<body>
    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>

                <asp:DropDownList ID="ddlYear" runat="server" Height="22px" Width="121px" OnSelectedIndexChanged="ddlYear_SelectedIndexChanged" AutoPostBack="True"></asp:DropDownList>
                <asp:DropDownList ID="ddlMonth" runat="server" Height="22px" Width="121px" AutoPostBack="True" OnSelectedIndexChanged="ddlMonth_SelectedIndexChanged"></asp:DropDownList>
            </ContentTemplate>

        </asp:UpdatePanel>
        <br /><br /><br />
        <div class="modal1"  >
            <div style="text-align:right">
         <button onclick="close()">close</button>
                </div>
            <h1>Loading..</h1>
        </div>
    </form>
</body>
</html>

protected void Page_Load(object sender, EventArgs e)
     {
         if (Page.IsPostBack) return;
         for (int i = 0; i < 10; i++)
             ddlYear.Items.Add("Year-" + i);


         for (int i = 0; i < 10; i++)
             ddlMonth.Items.Add("Month-" + i);

     }


     protected void ddlYear_SelectedIndexChanged(object sender, EventArgs e)
     {
         System.Threading.Thread.Sleep(2000); // for testing purpose to create a delay
     }

     protected void ddlMonth_SelectedIndexChanged(object sender, EventArgs e)
     {
         System.Threading.Thread.Sleep(2000); // for testing purpose to create a delay
     }

refer .net - What's the different between ASP.NET AJAX pageLoad() and JavaScript window.onload? - Stack Overflow[^]